A personal locator transmitter adapted to be worn on the wrist and having the size and appearance of a conventional wrist-watch. This transmitter is provided with a programmable memory, a transmitter controlled by the memory, an antenna for reliably radiating signals from the transmitter regardless of...http://www.google.de/patents/US5014040?utm_source=gb-gplus-sharePatent US5014040 - Personal locator transmitter
